pietzka



4 snets sneer, 14

(No Model.)

G. PIBTZKA.

ROTARY DGUBLE FLAME FURNAGB.

No. 398,973. Patented Mar. v5, 1889.

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(No Model.) 4 'sheets-sheet l G. PIETZKA.

ROTARY DOUBLE FLAME 'FURNAGR No. 398,973. Patented Mar, 5, 1889.

'4 sheets-sheen s.

(No Model.) l

G. PIETZKA.

ROTARY DOUBLE FLAME PURNAGE.

N PETERS. Mmmm-.pm wamngm n. c.

4 Sheetsfsheet 4.

(No Model.)

G. PIETZKA.

ROTARY DOUBLE FLAME PURNAGB.

Patented Mar. 5, 1889.

Wuss e5.

arzfeys LII llnirnn rares arcuri @terreno ROTARY DOUBLE-FLAIVIE FURNACE.

SPECIFICATION forming part of Letters Patent No. 398,973, dated March 5, 1889.

Application tiled March 16, 1888. Serial No. 267,411, (No model.) Patented in Austria-Hungary November l,i 1886, No. 30,909 and No. 55,631, and in Germany January 11, 1887,1\lo.40,2184

T0 all u'lom/ it 71mg/ conce/72,:

Be it known that I, GOTTFRIED lLETZKA, a subject ot the Emperor of Austria, residing at \\"itl(o\\'itz, Moravia-Empire of Austria, have invented new and useful Improvements in Rotary Double-Flame Furnaces, (tor which I have received Letters Patent in Germany, No. 40,218, January ll, 1887, and in Austria, No. 30,90), tome Elo, fol. 2,551, and Hungary, No. 55,631, tome XX, tol. 2,347, dated November l, 1886,) ot' which the following is a specification.

The invention relates to furnaces used for puddling and welding pig-iron or for manufacturing Martin steel.

The object of the invention is to provide a new and improved furnace adapted to be turned so as to avoid loss et heat and time in clearing away the iron and also to increase the quantity and quality o'l the product.

The invention consists of certain parts and details and combinations of the same, as will he Yfully described hereinafter, and then pointed out in the claims.

Reference is to he had to the accompanying drawings, forminga part of this specification, in Which similar letters ot' reference indicate corresponding parts in all the ligures.

Figure 1 is a longitudinal sectional elevation of the improvement. lfig. 2 is a sectional plan view ot the same on the line af of Fig. l. Fig. 3 is a vertical cross-section ot the same on the line t1/ 1,/ otl Fig. l. lfig. lis an enlarged sectional side elevation ot a modified form of turn-table. lig. 5 is a like viewol' another moditieationol the same. Fig. isa sectional side elevation ot' a modified torm of a device for raising the turn-table. Fig. 7 is a like View ot a modified form of the same. Fig. S is a sectional plan vieuv of the same on the line z' 2 of Fig. T. Fig. il is a sectional side eleva tion of another nunlitication ot' the turn-table.

Fig. l() is a like view of still another modification et the turn-table, and lf`ig. 'l1 is a sectional plan view of a modlicd form of the lied of the furnace.

The improved lfurnace is provided with the usual auxiliary apparatus, of any approved construction, such as blasting-engines, water-cooling pipes for the bridge-Walls, rte.

suck up the highly-heated air from below the bottom plate of the turning part of the furnace and discharge the same through the outlet-pipe 1V into the iire box or chamber F. The latter is provided on top with an outlet channel, C, adapted to register alternately with the channels C and D, leading to or from, as the case may be, the turning part of the furnace. The channels Cand D are also adapted to register alternately with the channel D', leading to the fixed chamber E and located directly opposite th e channel C ot the' 'lire box' or chamber l?.

The turning part of the furnace is formed principally of a double hearth, the parts K li et which are separated from each other by the Waterbridge B', but are in communication with each other and open into the channels C and D, above described. Each of the parts K K o't the hearth is provided with Working-openings T, arranged opposite cach other, as plainly shown in Fi 2. Each portion l( li. ot the hearth is also provided on its outer end With a lire-bridge, l and R2, respectively, and with suitable Watercooling contrivances. Y

The .movable part ot the [furnace terminates at the surfaces A A and B 13 (shown as lines in the longitudinal section of Fig. 1) of atruncated cone, the point ot' which is turned downward and in line with the axis of the turning part ot' the furnace. rlhe Whole furnace is constructed in such a manner that the masonry, which is principally made of tire-proof bricks, is placed in cast-iron boxes and firmly held together by armor-plates, rte.

As before stated, the suction-pipe. of the blasting apparatus is connected with the bot- TOO outside, so that the air enters in a cold state` below the bottom plates of the double hearth K and K', whereby the latter is cooled, as a part of the air is taken up by the said bottom plate. The other short pipe is immersed in a receptacle filled with water, in order to render it perfectly tight, and the air passes out through this short pipe into the suction-pipe NV', connected with the blasting apparatus V. The air discharged from the blasting apparatus is in a compressed state and Hows partly as upper blast along the iirewalls of the iire box or chamber F and partly through the grate, as under grate-blast. By introducing fresh air continuously under the bottom plate of the double hearth K and K' the furnace is cooled oif.

The bottom plate of the hearth K K' rests firmly on supports M, secured to the plate P, held on the upper end of a plunger, H,which moves up and down in the cylinder Z, the walls of which must be su tiiciently strong to resist the pressure corresponding' to the weight of the movable part of the furnace. The lifting of the plunger H is effected by means of a hand-pump or an accumulator, whiclrmay be fed by means of a pump operated by hand or other power. Then the movable part of the furnace has been raised to a considerable height and the two working parts K and K' of the hearth have been charged as uniformly as possible, the furnace is turned by hand or chain-gear, or by any other suitable means. As the plunger H forms the trunnion, so that the friction is relatively small, it is possible to turn the movable part of the furnace by hand. lVhen the movable part of the furnace is in its raised position, as shown in Fig. l, the plunger is discharged and the weight of the furnace is transferred to suitably-arranged rails located below the bottom of the movable part of t-he furnace.

The )ur )ose of this turning arrangement of l a c the furnace is as follows:

\Vhen the furnace is heated and the two working parts of the hearth are ready for action, material is introduced first into the part K next to the iire box or chamber F. lVhen the material is molten, the other part, K', is charged. In the first working part of the hearth the charge is treated in the usual way and finally worked out. During this time the iron is heating in the second part, K', and becomes perfectly liquid. Then the iirst part, K, is entirely worked oui,the turning part of the furnace is lifted by means of a hydraulic contrivance to a suitable pipe and turned one-half of the revolution, the hydraulic contrivancc operating on the plunger H so as to raise the same in its casing Z. The delivery-cock X (see Fig. l) of the casing Z is then opened, so that the water will iioW out of the casing Z and the turning part of the furnace will settle upon its support, whereby the iire bridge and iiue will be again perfectly joined with each other. As the joining surfaces A A' B B are conically tapered downward, there will be sufficient play; but after turning' the lifted'furnace and when theV latter has been lowered a perfectly-tight joint will be formed. The positions of the parts K K' of the hearth have then been reversed, and

the channel D of the part K now connects with the channel C of the heating-chamber F, and the channel C' of the part K connects wit-h the channel D', leading to the chimneyE. The material is now treated as usual in the second working part, K', 'which is next to the iire box or chamber F, and a fresh charge is immediately introduced in the first working part, which is now turned toward the channel D'. rlhe above-described operation is continually repeated as long as desired.

vrlhe double furnace,instead of being lifted at its plunger H by hydraulic means, may be lifted either by steam-pressure or by a lifting* jack. Fig. l shows an arrangement in which the trunnion H, working as a plungenpiston in the casing or cylinder Z, is lifted bythe direct action of steam. The steam enters through the two-waycoek a at l) below the plunger H and lifts the latter. The lifting action continues until the aperture c is uncovered by the lower end of the said plunger H, so that the steam may work through the pipe CZ, connected with the said opening c. The plunger piston can thus be kept under steam-pressure at the desired height and the furnace may be turned. The waste water maybe let off through the two-way cock a.

Fig. 5 illustrates the same construction, with the addition of a device for regulating the position of the plunger H. The latter is raised to the desired height, while at the same time the screw e is set in such a way that it takes up the whole weight of the piston. The screw e moves in a nut, f, formed into a toothed wheel, into which meshes a spur-wheel, g, op-

erated by a hand-wheel, 7i. Wvhen the latter is turned, the wheel g imparts a rotary motion to the nut' f, which turns the screw e' and raises and lowers the same and the plunger H accordingly.

In Fig. 6 conical wheels f and g' are used for moving' the nutf and the screw c, instead of using spur-wheels, as shown in Fig. 5.

In Figs. 7 and S a construction is shown for raising the plunger H by hand. The frame 7s, carrying the pivot Z, supports the lower end of the plunger H. The pivot Zand its frame 7e are raised and lowered by means of screws m and m', connected with the said frame k and turning in suitable nuts held in the base of the casing Z.

The screw m carries a hand- IOO IIO

wheel, 71, and both screws nl and m. are provided with Qrank-arn1s connected with each other' by a iframe, n, so that when the handirheel lz is turned the frame n. and the crankarins impart a simultaneous rotary motion to the screws nt and m, whereby the frame and its pivotare raised and lowered.

Fig. Sl shows another device for .lifting the plunger Il. The nut o is provided with a handwhcel, 71, and carries the rollers p, turning on a suitable circular track. in the lower end oi' the nut o, and is guided in its up-ainfl-doivn movementbj.' a prism, r. Instead ot' a handwheel, it, a. drawing-rod may be applied to the nut o, and the motion to be produced can be accomplished by a horse attached. to the said rod.

In the construction represented in Fig. IO the plunger ll is raised by lmeans of an eccentric, S, secured on a shaft inoved by hand or other power. According to the local conditions one or the other ot' the abovedescribed contrivanees ma)Y be applied. In cold countries-such as the northern part of Russia, tor instance-where the disposition of the water to Vfreeze renders its use impracticable during the winter season, the hydraulic lifting contrivance may preferably be replaced by the construction shown in Figs. ei and 7When neither Water nor steam is obtainable, one ot' the constructions represented in Figs. 7 to IO niay be employed. Furthermore, itis not necessary for the parts l( K of the hearth to be ot the identical same shape and size shown in Fig. lll. The principal point in constructinglhe 'furnace consists in distributing the Weight equally around the trunnion or pl ungcr ll. and in making the channels C and l) register with the channels C and D.

Haring thus fully described inyini'ention, I claim as new and desire to secure by Letters Patent-- The serev q screws i l. The combination, with a lire-box and a stack orehi1nney,of a double hearth or heating-chamber constructed and arranged to cennect altmnatel)v with the exit-flue of the lirebox and with. the chimney, and means for rotating said hearth, substantially as described.

2. The combination, with a lire-box and a stack, of a double hearth arranged between the lirebox and stack, a turn-table support ing the said heart-h, and means vter operating said turn-table, substantiallyv as herein shown and described.

il. rlhe combination,with a lirebox and a stack, of a double hearth arranged between the tire-box and stack and provided with opposite channels .leading therefrom, a turntable supporting' the hearth, and means for raising, lowering, and turning the said turntable, substantially as herein shown and described.

4. In a furnace, the combination, with a firebox and a chimney opposite the tire-box, oi. a double hearth between the fire-box and chimney and provided with an airchann el below the bottoni thereof, and a blast-engine connected with the said air-chamber and with the lirebox, substantially as herein shown and described.

5. In a furnace, the conibinatiini, with a hearth, of a partitioned channel, I, below7 the bottom of the hearth, and connected at one end with the open air and at the other end With the suction-pipe of a blast-engine, substantially as described.

In testimony whereof I h ave signed my name to this specification in the presence ot two subscribin g Witnesses.

GOTTFRIED PIETZKA.

ll'itnesses:

F. HAUDCK, EDMUND .Tussen 

